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DUBLINOhio Wendy’s International Inc., based here, said Thursday it has pledged to give preferential buying support to its pork and chicken suppliers who improve humane animal welfare systems.

Following a similar policy set by rival Burger King in April, Wendy’s said it plans to increase its purchases of pork products from hogs not raised in restrictive gestation stalls from 10 percent to 20 percent by the end of 2008.